Diversity and population dynamics of insect pests of mustard crop in hot arid region of Rajasthan: Diversity and population dynamics of insect pests of mustard

Sugan Chand Meena; Nisha Patel; Archana Sanyal; Anil Patidar; Saranya R; mavji patidar; Dilip Kumar

doi:10.59512/aaz.2023.62.4.6

Authors

Sugan Chand Meena
Nisha Patel
Archana Sanyal
Anil Patidar
Saranya R
mavji patidar
Dilip Kumar

https://doi.org/10.59512/aaz.2023.62.4.6

Keywords:

Arid Rajasthan, mustard, insect-pests, Lipaphis erysimi

Abstract

An investigation was carried out on the diversity of
insect pests of mustard and influence of weather parameters.
Survey and surveillance data were recorded from the 10 fields
under mustard cultivation located in a radius of 80 km in
Jaisalmer district during Rabi 2019-20 and 2020-21. Mustard
in these fields was grown either as rainfed (three fields) or
irrigated (four with tube well and three with canal water) crop.
The data from one site was also used to find out correlation
between mustard aphid population and weather parameters.
Data on different insects infesting the mustard crop, namely
aphid, painted bug, cabbage looper, leaf miner, diamond back
moth, white fly, jassid, black flea beetle, mustard saw fly and
flower weevil were recorded. Appearance of winged aphid
started after one month of sowing [45th-46th Standard Week
(SW)]. The aphid population on crop remained negligible
up to second fortnight of December. Population buildup
started in first fortnight of January and peaked in February.
It was observed that in rainfed areas the aphid reached to
peak population of 54.58 aphids plant-1 in second fortnight of
February (8th - 9th SW) while in tube well and canal irrigated area
the peak population was nearly double of the rainfed areas.
In tube well irrigated areas the peak reached earlier than in
rainfed areas while in canal irrigated areas population peaked
at the same time as in rainfed areas. Relative density was
highest (41.47%) in canal area followed by tube well (36.91%)
and rainfed area (21.62%). The aphid population showed
significant positive correlation with maximum temperature
and positive correlation with minimum temperature,
sunshine hours and rainfall. Although rainfall showed
positive correlation but remained of minor significance.
Aphid population showed negative and significant negative
correlation with minimum and maximum relative humidity.

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